System and method for capturing dose information

1. A device for capturing delivered dose information, comprising: a medication delivery device comprising a syringe barrel and a plunger; a dose information capture device adapted to be removably attached to the syringe barrel of the medication delivery device; the dose information capture device comprising a Hall-effect sensor having a substantially linear analog output voltage; and a target element adapted to be removably attached to the plunger of the medication delivery device; wherein the target element comprises a magnet or a ferrous element inside the syringe barrel, and the target element attaches to the medication delivery device on the plunger of the medication delivery device, and wherein the dose information capture device includes the Hall-effect sensor adapted to output a substantially linear analog output voltage in response to a position of the target element relative to the magnetic position sensor, the magnetic position sensor generating a signal with a magnitude that changes substantially linearly as a distance from the target element to the magnetic position sensor changes.

2. The device of claim 1 , wherein the medication delivery device comprises an RFID chip.

3. The device of claim 1 , wherein the magnetic position sensor comprises a rotational magnet position sensor.

4. The device of claim 1 , wherein the medication delivery device is a syringe and the magnetic position sensor attaches to a plunger.

5. A system for determining doses of medicament delivered to a patient comprising: a syringe having a target element movable together with and inside of a syringe plunger; a dose information capture device adapted to be removably attached to the syringe, the dose information capture device comprising a Hall-effect sensor adapted to output a substantially linear analog output voltage in response to a position of the target element the Hall-effect sensor arranged to sense a position of the target element when the dose information capture device is attached to the syringe, the Hall-effect sensor generating a substantially linear analog signal with a magnitude that changes as a distance from the Hall-effect sensor to the target element changes; a processor; and a memory comprising instructions adapted to control the processor to determine a dose delivered based on at least one position determination of the plunger.

6. The system of claim 5 , further comprising a transceiver adapted to transmit determined dose information to a remote device.

7. A system for capturing delivered dose information, comprising: a medicament vial having a medicament volume sensor attached to a sidewall of the medicament vial; a processor; a memory comprising instructions adapted to control the processor to receive medicament volume measurements from the medicament volume sensor, and to determine a difference in volume prior to a dose delivery and after the dose delivery; and a plurality of magnetic beads or a magnetic ring having a diameter substantially similar but small than an inner diameter of the medicament vial, the beads or ring having a density less than a density of a medicament within the medicament vial, the beads or ring being disposed within the medicament vial and floating within the medicament in the medicament vial; and wherein the medicament volume sensor comprises a magnetic sensor in proximity to the medicament vial to detect a location of the magnetic beads or ring within the medicament vial.

8. The system of claim 7 , wherein the plurality of magnetic beads is sufficient to substantially cover an exposed surface of the medicament within the vial.